PC keyboard
E is the main context action for pickup and placement, G drops the held item, and R rotates the washer. Work from the visible prompt rather than pressing repeatedly: a missing prompt usually means you are too far away, facing the wrong surface, or holding an object that blocks the next interaction.
Controller
The right trigger handles pickup and placement, the left trigger drops, and Y opens upgrades. Keep pickup/place and drop mentally separate. Returning an item usually needs the precise placement action, while drop is better for clearing your hands or making a temporary review pile.
Mobile
The current official page does not publish stable mobile button names. Mobile interfaces can also move as Roblox and the game update. Use the action labels shown around your screen, match them to Pickup/Place, Drop, Rotate, or Upgrades, and avoid any third-party download that claims to replace the Roblox controls.